Add utility for splitting version string into integer parts

tests/version_tools_tests.cc

@@ -0,0 +1,46 @@
+#include "doctest.h"
+#include "util/version_tools.hh"
+
+TEST_CASE("parse") {
+	{
+		auto vers = VersionUtil::parse_version("1.2.16");
+		CHECK(vers.major == 1);
+		CHECK(vers.minor == 2);
+		CHECK(vers.revision == 16);
+	}
+
+	{
+		auto vers = VersionUtil::parse_version("9.1");
+		CHECK(vers.major == 9);
+		CHECK(vers.minor == 1);
+		CHECK(vers.revision == 0);
+	}
+
+	{
+		auto vers = VersionUtil::parse_version("2.0.99");
+		CHECK(vers.major == 2);
+		CHECK(vers.minor == 0);
+		CHECK(vers.revision == 99);
+	}
+
+	{
+		auto vers = VersionUtil::parse_version("2099");
+		CHECK(vers.major == 2099);
+		CHECK(vers.minor == 0);
+		CHECK(vers.revision == 0);
+	}
+
+	{
+		auto vers = VersionUtil::parse_version("garbage");
+		CHECK(vers.major == 0);
+		CHECK(vers.minor == 0);
+		CHECK(vers.revision == 0);
+		// try {
+		// 	auto vers = VersionUtil::parse_version("garbage");
+		// 	(void)vers;
+		// 	CHECK(false);
+		// } catch (std::exception) {
+		// 	CHECK(true);
+		// }
+	}
+}

util/version_tools.hh

@@ -0,0 +1,45 @@
+#pragma once
+#include <ranges>
+#include <string_view>
+
+namespace VersionUtil
+{
+
+struct Version {
+	unsigned major;
+	unsigned minor;
+	unsigned revision;
+
+	void set_field(unsigned index, unsigned val) {
+		if (index == 0)
+			major = val;
+		if (index == 1)
+			minor = val;
+		if (index == 2)
+			revision = val;
+	}
+};
+
+auto split(std::string_view str, std::string_view delim) {
+	auto tokens = str | std::ranges::views::split(delim) | std::ranges::views::transform([](auto &&str) {
+		return std::string_view(&*str.begin(), std::ranges::distance(str));
+	});
+	return tokens;
+}
+
+Version parse_version(std::string_view vers) {
+	auto tokens = split(vers, ".");
+	Version version{};
+
+	for (unsigned i = 0; auto &&token : tokens) {
+		auto num = strtoul(token.data(), nullptr, 10);
+
+		version.set_field(i, num);
+
+		if (++i >= 3)
+			break;
+	}
+	return version;
+}
+
+} // namespace VersionUtil